InstanceDataCollectionCollection.Item[String] Propriété

Définition

Espace de noms:

System.Diagnostics

Assembly:

System.Diagnostics.PerformanceCounter.dll

Paquet:

System.Diagnostics.PerformanceCounter v8.0.0

Source:

InstanceDataCollectionCollection.cs

Obtient les données d'instance du compteur spécifié.

public:
 property System::Diagnostics::InstanceDataCollection ^ default[System::String ^] { System::Diagnostics::InstanceDataCollection ^ get(System::String ^ counterName); };

public System.Diagnostics.InstanceDataCollection this[string counterName] { get; }

member this.Item(string) : System.Diagnostics.InstanceDataCollection

Default Public ReadOnly Property Item(counterName As String) As InstanceDataCollection

Paramètres

counterName

String

Nom du compteur de performance.

Valeur de propriété

InstanceDataCollection

Élément InstanceDataCollection par lequel l'objet InstanceDataCollectionCollection est indexé.

Exceptions

ArgumentNullException

Le paramètre counterName a la valeur null.

Exemples

L’exemple de code suivant accepte un nom de catégorie et un PerformanceCounter nom de compteur à partir de la ligne de commande. Il obtient le InstanceDataCollectionCollection pour .PerformanceCounterCategory Ensuite, si le PerformanceCounter existe, l’exemple utilise la Item[] propriété (référencée en tant qu’indexeur) pour obtenir le associé InstanceDataCollection et affiche les noms instance de la collection.

public static void Main(string[] args)
{
    // The following values can be used as arguments.
    string categoryName = "Process";
    string counterName = "Private Bytes";

    InstanceDataCollectionCollection idColCol;

    // Copy the supplied arguments into the local variables.
    try
    {
        categoryName = args[0];
        counterName = args[1];
    }
    catch
    {
        // Ignore the exception from non-supplied arguments.
    }

    try
    {
        // Get the InstanceDataCollectionCollection for this category.
        PerformanceCounterCategory pcc = new PerformanceCounterCategory(categoryName);
        idColCol = pcc.ReadCategory();
    }
    catch(Exception ex)
    {
        Console.WriteLine("An error occurred getting the InstanceDataCollection for " +
            "category \"{0}\"."+ "\n" +ex.Message, categoryName);
        return;
    }

    // Check if this counter name exists using the Contains
    // method of the InstanceDataCollectionCollection.
    if (!idColCol.Contains(counterName))
    {
        Console.WriteLine("Counter \"{0}\" does not exist in category \"{1}\".", counterName, categoryName);
        return;
    }
    else
    {
        // Now get the counter's InstanceDataCollection object using the
        // indexer (Item property) for the InstanceDataCollectionCollection.
        InstanceDataCollection countData = idColCol[counterName];

        ICollection idColKeys = countData.Keys;
        string[] idColKeysArray = new string[idColKeys.Count];
        idColKeys.CopyTo(idColKeysArray, 0);

        Console.WriteLine("Counter \"{0}\" of category \"{1}\" " +
            "has {2} instances.", counterName, categoryName, idColKeys.Count);

        // Display the instance names for this counter.
        int index;
        for(index=0; index<idColKeysArray.Length; index++)
        {
            Console.WriteLine("{0,4} -- {1}", index+1, idColKeysArray[index]);
        }
    }
}

Sub Main(ByVal args() As String)
    Dim categoryName As String = ""
    Dim counterName As String = ""

    Dim idColCol As InstanceDataCollectionCollection

    ' Copy the supplied arguments into the local variables.
    Try
        categoryName = args(0)
        counterName = args(1)
    Catch ex As Exception
        ' Ignore the exception from non-supplied arguments.
    End Try

    Try
        ' Get the InstanceDataCollectionCollection for this category.
        Dim pcc As New PerformanceCounterCategory(categoryName)
        idColCol = pcc.ReadCategory()
    Catch ex As Exception
        Console.WriteLine( _
            "An error occurred getting the InstanceDataCollection for " & _
            "category ""{0}""." & vbCrLf & ex.Message, categoryName)
        Return
    End Try

    ' Check if this counter name exists using the Contains
    ' method of the InstanceDataCollectionCollection.
    If Not idColCol.Contains(counterName) Then
        Console.WriteLine( _
            "Counter ""{0}"" does not exist in category ""{1}"".", _
            counterName, categoryName)
        Return
    Else
        ' Now get the counter's InstanceDataCollection object using the
        ' indexer (Item property) for the InstanceDataCollectionCollection.
        Dim countData As InstanceDataCollection = idColCol(counterName)

        Dim idColKeys As ICollection = countData.Keys
        Dim idColKeysArray(idColKeys.Count - 1) As String
        idColKeys.CopyTo(idColKeysArray, 0)

        Console.WriteLine("Counter ""{0}"" of category ""{1}"" " & _
            "has {2} instances.", counterName, categoryName, idColKeys.Count)

        ' Display the instance names for this counter.
        Dim index As Integer
        For index = 0 To idColKeysArray.Length - 1
            Console.WriteLine("{0,4} -- {1}", index + 1, idColKeysArray(index))
        Next index
    End If
End Sub

Remarques

Le counterName paramètre ne respecte pas la casse.

Chaque InstanceDataCollection objet de la collection contient les données de performances de tous les compteurs d’un instance. Les données sont indexées par nom de compteur, puis par instance nom. L’indexeur utilise le counterName paramètre pour parcourir les compteurs associés à cette collection de données instance.